Effects of Fructooligosaccharides on Growth Performance and Weaning Stress of Suckling Lambs
The aim of this experiment was to study the effects of fructooligosaccharides on the growth perform-ance and weaning stress of suckling lambs.Forty-four male lambs at 15 days of age with similar body weight were randomly divided into 4 groups with 11 lambs per group.Lambs in the control group were fed the starter without fructooligosaccharides,and others in experimental groups Ⅰ,Ⅱ and Ⅲ were fed the starter supple-mented with 0.5％,1.0％ and 1.5％ fructooligosaccharides,respectively.The feed intake and body weight of lambs were recorded during the experimental period,and blood samples were collected on the day of weaning(day 0),day 3 and day 7 to determine the serum biochemical indexes.The lambs were weaned at 60 days of age and continued to be fed until 74 days of age,the experimental period was 59 days.The results showed as follows:1)the final body weight and average daily gain(ADG)of group Ⅱ were significantly higher than those of the control group(P＜0.05).2)On day 0,day 3 and day 7,the serum malondialdehyde(MDA)content of groups Ⅱ and Ⅲ was significantly lower than that of the control group(P＜0.05).On day 0 and day 7,the serum superoxide dismutase(SOD)activity of group Ⅱ was significantly higher than that of the control group(P＜0.05).On day 0,day 3 and day 7,the serum total antioxidant capacity(T-AOC)of groups Ⅰ and Ⅲ was significantly higher than that of the control group(P＜0.05).3)On day 0,day 3 and day 7,the serum interleukin-4(Ⅰ L-4)content of groups Ⅰ,Ⅱ and Ⅲ was significantly higher than that of the control group(P＜0.05),and the serum interleukin-6(IL-6)content was significantly lower than that of the control group(P＜0.05);the serum tumor necrosis factor-α(TNF-α)content of groups Ⅱ and Ⅲ was significantly lower than that of the control group(P＜0.05),the serum interferon-y(IFN-γ)content of groupⅡ was significantly lower than that of the control group(P＜0.05).4)On day 3 and day 7,the contents of di-amine oxidase(DAO),D-lactate(D-LA)and cortisol(COR)in serum of group Ⅱ were significantly lower than those of the control group(P＜0.05).In conclusion,the addition of fructooligosaccharides in starter can improve the growth performance by enhancing immunity and alleviating weaning stress of suckling lambs.The optimum addition of fructooligosaccharides is 1.0％under the conditions of this experiment.[Chinese Journal of Animal Nutrition,2024,36(1):397-405]
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